We offer tungsten disulphide. Specifications: properties ws2colour silver grayappearance crystalline solidmelting point (oc) 1250oc, 1260oc (decomposes)density (kg.m-3) 7500molecular weight 248coefficient of friction 0.03 dynamic; 0.07 staticlubrication temperature range ambient: from -273oc to 650oc vacuum (10 -14 torr): from -188oc to 1316oc